A professional hentai
Commonly wears glasses, has a camera, sneaks around appearing from weird places, and finally is an expert stalker. Women will fear him, men will either beat him up or look up to his pro skillz.
Yasudas also suffer from anemia
and weakness, mainly because of excessive loss of blood from nosebleeds. The cause of the nosebleeding is uncertain, but most often occurs around cute/beautiful women.
There is no known counter-measure to his sneaky ways. Nor is there anywhere to hide. Run... run while you still can...